The advanced support pressure generated in the mining process of working face may cause damage to the air stop-ping constructed in crossheading during the mining process of upper section, which will make the cracks appear and the air leakage occur, causing oxygen supply to the goaf. In order to solve the disadvantages that the current countermeasures can only reduce the amount of air leakage but can't consume and remove the oxygen in air leakage when the cracks appear in the air stopping, an initiative deoxidation type air stopping was designed by using the deoxidizer with the function of oxygen con-sumption, and the oxygen concentration distribution when occurring air leakage in ordinary air stopping and initiative deoxi-dation type air stopping were compared through numerical simulation. The results showed that under the same conditions of air leakage, when adding deoxidizer in ordinary air stopping to become initiative deoxidation type air stopping, the oxygen concentration of air leakage from the air stopping reduces significantly, and the amount of oxygen leaking into goaf decreases effectively. In addition, through the deoxidation of air leakage, the residual N2 with high concentration plays an inerting effect on goaf, and reduces the oxygen concentration near the goaf.%工作面回采过程中产生的超前支撑压力,会对上区段回采过程中在联络巷构筑的密闭造成破坏,使之产生裂隙出现漏风,向采空区供氧。为解决目前密闭出现裂隙后只能采取措施减少漏风而不能将漏风中氧气消耗、除去的弊端,利用具有耗氧功能的脱氧剂,设计了主动脱氧型密闭,并通过数值模拟将普通密闭与该密闭漏风时氧浓度分布进行对比。研究表明：相同漏风情况下,普通密闭中添加脱氧剂成为主动脱氧型密闭后,使漏出密闭风流的氧浓度大幅降低,有效减少了进入采空区的氧气量；另外,经过脱氧的密闭漏风,剩余高浓度的N2,对采空区起到了惰化效果,降低了采空区附近的氧浓度。
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